Main features widgets

Hi,

No way to do it using customizer.
What you can do is override them with your own CSS. To do that, you should do the following:

1. In the widget, where you set the “icon”, give it some distinguishing name, let’s say “image-left-1”.
2. In styles.css, add the following code:

.fa.image-left-1::before {
content: '';
}

.fa.image-left-1 {
background: url(http://url/to/your/image.png) no-repeat;
width: 50px;
height: 50px;
}

Change the url to your path, change width/height of the image as per your design.

Thanks for that dsntlt, was also struggling with similar..